National Fire Protection Association Labeling
NFPA uses a symbol system designed as a diamond-shaped label containing four differently colored squares. A number (0-4) or an abbreviation is added to each square indicating the order of hazard severity. The higher the number, the greater the hazard.
NFPA Labeling System
| Red background = Flammability | Yellow Background = Reactivity |
| 4 - flash point < 73º F 3 - flash point < 100ºF 2 - flash point > 100ºF to < 200 ºF 1 - flash point > 200ºF 0 - will not burn |
4 - Explosive at room temperature. 3 - Shock and heat may detonate 2 - Violent reaction with water 1 - Unsafe if heated, not violent 0 - Not reactive with water. |
| Blue Background = Health Hazard. | White Background = Specific Hazard. |
| 4 - Deadly 3 - Extreme danger 2 - Hazardous 1- Slightly Hazardous 0 - Normal material |
Oxidizer : OX Acid: ACID Alkali: ALK Corrosive: CORR Use No Water: W |